[stage1][PATCH] Add gcc_assert that &global_options are not dirty modified.

[Jeff Law]

On Thu, 2020-06-18 at 14:21 +0200, Martin Liška wrote:
> On 6/18/20 1:32 PM, Luis Machado wrote:
> > FTR, I'm running into this ICE when attempting to build the Linux Kernel for arm64.
> 
> Hello.
> 
> Thanks for the report.
> 
> > More specifically:
> > 
> > /repos/linux-arm/kernel/bpf/core.c:1368:1: internal compiler error: ‘global_options’ are modified in local context
> >   1368 | {
> >        | ^
> > 0xc0554b cl_optimization_compare(gcc_options*, gcc_options*)
> >          /build/gcc-master/gcc/options-save.c:9786
> > 0x7812df handle_optimize_attribute
> >          ../../../repos/gcc/gcc/c-family/c-attribs.c:4475
> > 0x666477 decl_attributes(tree_node**, tree_node*, int, tree_node*)
> >          ../../../repos/gcc/gcc/attribs.c:714
> > 0x688c9b start_function(c_declspecs*, c_declarator*, tree_node*)
> >          ../../../repos/gcc/gcc/c/c-decl.c:9177
> > 0x6f85f3 c_parser_declaration_or_fndef
> >          ../../../repos/gcc/gcc/c/c-parser.c:2434
> > 0x7038af c_parser_external_declaration
> >          ../../../repos/gcc/gcc/c/c-parser.c:1773
> > 0x7044c7 c_parser_translation_unit
> >          ../../../repos/gcc/gcc/c/c-parser.c:1646
> > 0x7044c7 c_parse_file()
> >          ../../../repos/gcc/gcc/c/c-parser.c:21822
> > 0x764897 c_common_parse_file()
> >          ../../../repos/gcc/gcc/c-family/c-opts.c:1190
> > Please submit a full bug report,
> > with preprocessed source if appropriate.
> > Please include the complete backtrace with any bug report.
> > See <https://gcc.gnu.org/bugs/> for instructions.
> > 
> > I don't have a reduced testcase for this, but I thought I'd check if this is known/being worked on before filing a bug.
> 
> It's not a known issue. Please attach me the used command line and pre-processed source file
> (using -E option).
You might try arc-elf gcc.dg/pr91734.c.  I've been behind and just peeked at the
arc-elf regressions in the tester a moment ago and it's tripping this as well.

Executing on host: /home/jenkins/workspace/arc-elf/arc-elf-obj/gcc/gcc/xgcc -B/home/jenkins/workspace/arc-elf/arc-elf-obj/gcc/gcc/ /home/jenkins/gcc/gcc/testsuite/gcc.dg/pr91734.c gcc_tg.o    -fno-diagnostics-show-caret -fno-diagnostics-show-line-numbers -fdiagnostics-color=never  -fdiagnostics-urls=never   -ansi -pedantic-errors -O2 -std=gnu99     -Wl,-wrap,exit -Wl,-wrap,_exit -Wl,-wrap,main -Wl,-wrap,abort -lm  -o ./pr91734.exe    (timeout = 300)
spawn -ignore SIGHUP /home/jenkins/workspace/arc-elf/arc-elf-obj/gcc/gcc/xgcc -B/home/jenkins/workspace/arc-elf/arc-elf-obj/gcc/gcc/ /home/jenkins/gcc/gcc/testsuite/gcc.dg/pr91734.c gcc_tg.o -fno-diagnostics-show-caret -fno-diagnostics-show-line-numbers -fdiagnostics-color=never -fdiagnostics-urls=never -ansi -pedantic-errors -O2 -std=gnu99 -Wl,-wrap,exit -Wl,-wrap,_exit -Wl,-wrap,main -Wl,-wrap,abort -lm -o ./pr91734.exe^M
/home/jenkins/gcc/gcc/testsuite/gcc.dg/pr91734.c:8:1: internal compiler error: 'global_options' are modified in local context^M
0xc8590f cl_optimization_compare(gcc_options*, gcc_options*)^M
        /home/jenkins/workspace/arc-elf/arc-elf-obj/gcc/gcc/options-save.c:9479^M
0x870808 handle_optimize_attribute^M
        ../../../../../gcc/gcc/c-family/c-attribs.c:4475^M
0x784d3f decl_attributes(tree_node**, tree_node*, int, tree_node*)^M
        ../../../../../gcc/gcc/attribs.c:714^M
0x7a0b90 start_function(c_declspecs*, c_declarator*, tree_node*)^M
        ../../../../../gcc/gcc/c/c-decl.c:9177^M
0x7f97f7 c_parser_declaration_or_fndef^M
        ../../../../../gcc/gcc/c/c-parser.c:2434^M
0x801e33 c_parser_external_declaration^M
        ../../../../../gcc/gcc/c/c-parser.c:1773^M
0x802881 c_parser_translation_unit^M
        ../../../../../gcc/gcc/c/c-parser.c:1646^M
0x802881 c_parse_file()^M
        ../../../../../gcc/gcc/c/c-parser.c:21822^M
0x85ab6b c_common_parse_file()^M
        ../../../../../gcc/gcc/c-family/c-opts.c:1190^M
>